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I want to find out how the length of a wire changes the amount of voltage and current flowing though the wire showing its resistance.

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Introduction

Science Investigation

PLANNING & PREDICTING

I want to find out how the length of a wire changes the amount of voltage and current flowing though the wire showing its resistance. My prediction for the experiment is that as the length of the wire increases the resistance will also increase and as the wire decreases so will the resistance.

I think this will happen because the loose electrons are being transported around the circuit and the wire will provide resistance to these, as it is like passing through a sponge rather than air. And so as there is more wire or sponge to pass through it will take increasingly longer and that is why I predicted that.         

        I will change

...read more.

Middle

0.300

0.605

0.894

40

0.24

0.46

1.4

0.300

0.608

0.904

50

0.18

0.38

1

0.302

0.603

0.903

60

0.15

0.32

0.8

0.305

0.607

0.906

70

0.12

0.27

0.8

0.309

0.609

0.905

80

0.11

0.23

0.7

0.297

0.603

0.909

90

0.1

0.2

0.6

0.300

0.602

0.910

100

0.09

0.18

0.4

0.305

0.596

0.890

Length of wire

(cm)

Ex 1

Current x Actual Voltage (   )

Ex 2

Current x Actual Voltage (   )

Ex 3

...read more.

Conclusion

Evaluation

I think that the experiment went very well and I got the results I predicted and did not have any odd results. My method was probably the best method for carrying out this experiment. I could improve it though by doing each experiment more times and at smaller intervals of wire size e.g. every 5cm. I could make the results more accurate by making sure the voltage was exactly what is meant to be e.g. 0.6v not 0.605v. I think I have enough data to support my conclusion and the results are reliable however I could make them more reliable by doing each experiment more times.

        I think to provide more evidence for my idea by doing wires with different widths or thickness to prove that the more for the current to pass through the more the resistance.

...read more.

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